data_global _chemical_name_mineral 'Nanpingite' loop_ _publ_author_name 'Ni Y' 'Hughes J M' _journal_name_full 'American Mineralogist' _journal_volume 81 _journal_year 1996 _journal_page_first 105 _journal_page_last 110 _publ_section_title ; The crystal structure of nanpingite-2M2, the Cs end-member of muscovite ; _database_code_amcsd 0001774 _chemical_formula_sum 'Cs.88 K.06 Rb.01 Al2.34 Mg.2 Fe.16 Li.14 Si3.16 O11.8 (F.2 H1.8)' _cell_length_a 9.076 _cell_length_b 5.226 _cell_length_c 21.41 _cell_angle_alpha 90 _cell_angle_beta 99.48 _cell_angle_gamma 90 _cell_volume 1001.633 _exptl_crystal_density_diffrn 3.191 _symmetry_space_group_name_H-M 'C 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv Cs 0.00000 0.09610 0.25000 0.88000 0.02318 K 0.00000 0.09610 0.25000 0.06000 0.02318 Rb 0.00000 0.09610 0.25000 0.01000 0.02318 Al2 0.08370 0.25030 0.00000 0.75000 0.01153 Mg2 0.08370 0.25030 0.00000 0.10000 0.01153 Fe2 0.08370 0.25030 0.00000 0.08000 0.01153 Li2 0.08370 0.25030 0.00000 0.07000 0.01153 Si1 0.11970 0.58840 0.12720 0.79000 0.01381 Al1 0.11970 0.58840 0.12720 0.21000 0.01381 Si2 0.29010 0.10090 0.12710 0.79000 0.01381 Al2 0.29010 0.10090 0.12710 0.21000 0.01381 O1 0.07630 0.56100 0.05050 1.00000 0.02026 O2 0.26720 0.13200 0.05040 1.00000 0.01900 O3 0.20530 0.33200 0.15810 1.00000 0.01646 O4 0.46700 0.12100 0.15910 1.00000 0.01900 O5 0.23190 0.82500 0.14890 1.00000 0.02406 O-H6 0.95450 0.06200 0.04680 0.90000 0.01900 F6 0.95450 0.06200 0.04680 0.10000 0.01900